LDR DD
LDR D
RDD U

RDL DD
LDR D
RDD U

LDR DD
RDLURD U
LDRULD U

LUR sequence
DU11D R
URDLUU D position U
LDD U

LUR sequence
DUR push
LR11U D
RDD U

LUR sequence
DUR position
LR10R U
RUU D
RDD U

LUR sequence
DRU D
push 3 exit